udp.h File Reference

#include <pshpack1.h>
#include <poppack.h>

Include dependency graph for udp.h:

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Classes
struct	UDP_HEADER
struct	UDP_PSEUDO_HEADER
struct	UDP_STATISTICS

Macros
#define	UDP_STARTING_PORT   0x8000
#define	UDP_DYNAMIC_PORTS   0x8000

Typedefs
typedef struct UDP_HEADER	UDP_HEADER
typedef struct UDP_HEADER *	PUDP_HEADER
typedef struct UDP_PSEUDO_HEADER	UDP_PSEUDO_HEADER
typedef struct UDP_PSEUDO_HEADER *	PUDP_PSEUDO_HEADER
typedef struct UDP_STATISTICS	UDP_STATISTICS
typedef struct UDP_STATISTICS *	PUDP_STATISTICS

Functions
VOID	UDPSend (PVOID Context, PDATAGRAM_SEND_REQUEST SendRequest)
NTSTATUS	UDPSendDatagram (PADDRESS_FILE AddrFile, PTDI_CONNECTION_INFORMATION ConnInfo, PCHAR BufferData, ULONG DataSize, PULONG DataUsed)
VOID	UDPReceive (PIP_INTERFACE Interface, PIP_PACKET IPPacket)
NTSTATUS	UDPStartup (VOID)
NTSTATUS	UDPShutdown (VOID)
UINT	UDPAllocatePort (UINT HintPort)
VOID	UDPFreePort (UINT Port)

Variables
UDP_STATISTICS	UDPStats

Macro Definition Documentation

UDP_DYNAMIC_PORTS

#define UDP_DYNAMIC_PORTS   0x8000

Definition at line 11 of file udp.h.

UDP_STARTING_PORT

#define UDP_STARTING_PORT   0x8000

Definition at line 10 of file udp.h.

Typedef Documentation

PUDP_HEADER

typedef struct UDP_HEADER * PUDP_HEADER

PUDP_PSEUDO_HEADER

typedef struct UDP_PSEUDO_HEADER * PUDP_PSEUDO_HEADER

PUDP_STATISTICS

typedef struct UDP_STATISTICS * PUDP_STATISTICS

UDP_HEADER

typedef struct UDP_HEADER UDP_HEADER

UDP_PSEUDO_HEADER

typedef struct UDP_PSEUDO_HEADER UDP_PSEUDO_HEADER

UDP_STATISTICS

typedef struct UDP_STATISTICS UDP_STATISTICS

Function Documentation

UDPAllocatePort()

UINT UDPAllocatePort

(

UINT

HintPort

)

Definition at line 385 of file udp.c.

                                      {
    if( HintPort ) {
        if( AllocatePort( &UDPPorts, HintPort ) ) return HintPort;
        else return (UINT)-1;
    } else return AllocatePortFromRange
               ( &UDPPorts, UDP_STARTING_PORT,
                 UDP_STARTING_PORT + UDP_DYNAMIC_PORTS );
}

Referenced by FileOpenAddress().

UDPFreePort()

VOID UDPFreePort

(

UINT

Port

)

Definition at line 394 of file udp.c.

                              {
    DeallocatePort( &UDPPorts, Port );
}

Referenced by AddrFileFree().

UDPReceive()

VOID UDPReceive	(	PIP_INTERFACE	Interface,
		PIP_PACKET	IPPacket
	)

Definition at line 241 of file udp.c.

{
  AF_SEARCH SearchContext;
  PIPv4_HEADER IPv4Header;
  PADDRESS_FILE AddrFile;
  PUDP_HEADER UDPHeader;
  PIP_ADDRESS DstAddress, SrcAddress;
  UINT DataSize, i;

  TI_DbgPrint(MAX_TRACE, ("Called.\n"));

  switch (IPPacket->Type) {
  /* IPv4 packet */
  case IP_ADDRESS_V4:
    IPv4Header = IPPacket->Header;
    DstAddress = &IPPacket->DstAddr;
    SrcAddress = &IPPacket->SrcAddr;
    break;

  /* IPv6 packet */
  case IP_ADDRESS_V6:
    TI_DbgPrint(MIN_TRACE, ("Discarded IPv6 UDP datagram (%i bytes).\n", IPPacket->TotalSize));

    /* FIXME: IPv6 is not supported */
    return;

  default:
    return;
  }

  UDPHeader = (PUDP_HEADER)IPPacket->Data;

  /* Calculate and validate UDP checksum */
  i = UDPv4ChecksumCalculate(IPv4Header,
                             (PUCHAR)UDPHeader,
                             WH2N(UDPHeader->Length));
  if (i != DH2N(0x0000FFFF) && UDPHeader->Checksum != 0)
  {
      TI_DbgPrint(MIN_TRACE, ("Bad checksum on packet received.\n"));
      return;
  }

  /* Sanity checks */
  i = WH2N(UDPHeader->Length);
  if ((i < sizeof(UDP_HEADER)) || (i > IPPacket->TotalSize - IPPacket->Position)) {
    /* Incorrect or damaged packet received, discard it */
    TI_DbgPrint(MIN_TRACE, ("Incorrect or damaged UDP packet received.\n"));
    return;
  }

  DataSize = i - sizeof(UDP_HEADER);

  /* Go to UDP data area */
  IPPacket->Data = (PVOID)((ULONG_PTR)IPPacket->Data + sizeof(UDP_HEADER));

  /* Locate a receive request on destination address file object
     and deliver the packet if one is found. If there is no receive
     request on the address file object, call the associated receive
     handler. If no receive handler is registered, drop the packet */

  AddrFile = AddrSearchFirst(DstAddress,
                             UDPHeader->DestPort,
                             IPPROTO_UDP,
                             &SearchContext);
  if (AddrFile) {
    do {
      DGDeliverData(AddrFile,
            SrcAddress,
                    DstAddress,
            UDPHeader->SourcePort,
            UDPHeader->DestPort,
                    IPPacket,
                    DataSize);
      DereferenceObject(AddrFile);
    } while ((AddrFile = AddrSearchNext(&SearchContext)) != NULL);
  } else {
    /* There are no open address files that will take this datagram */
    /* FIXME: IPv4 only */
    TI_DbgPrint(MID_TRACE, ("Cannot deliver IPv4 UDP datagram to address (0x%X).\n",
      DN2H(DstAddress->Address.IPv4Address)));

    /* FIXME: Send ICMP reply */
  }
  TI_DbgPrint(MAX_TRACE, ("Leaving.\n"));
}

Referenced by UDPStartup().

UDPSend()

VOID UDPSend	(	PVOID	Context,
		PDATAGRAM_SEND_REQUEST	SendRequest
	)

UDPSendDatagram()

NTSTATUS UDPSendDatagram	(	PADDRESS_FILE	AddrFile,
		PTDI_CONNECTION_INFORMATION	ConnInfo,
		PCHAR	BufferData,
		ULONG	DataSize,
		PULONG	DataUsed
	)

Definition at line 150 of file udp.c.

{
    IP_PACKET Packet;
    PTA_IP_ADDRESS RemoteAddressTa = (PTA_IP_ADDRESS)ConnInfo->RemoteAddress;
    IP_ADDRESS RemoteAddress;
    IP_ADDRESS LocalAddress;
    USHORT RemotePort;
    NTSTATUS Status;
    PNEIGHBOR_CACHE_ENTRY NCE;
    KIRQL OldIrql;

    LockObject(AddrFile, &OldIrql);

    TI_DbgPrint(MID_TRACE,("Sending Datagram(%x %x %x %d)\n",
                           AddrFile, ConnInfo, BufferData, DataSize));
    TI_DbgPrint(MID_TRACE,("RemoteAddressTa: %x\n", RemoteAddressTa));

    switch( RemoteAddressTa->Address[0].AddressType ) {
    case TDI_ADDRESS_TYPE_IP:
        RemoteAddress.Type = IP_ADDRESS_V4;
        RemoteAddress.Address.IPv4Address =
            RemoteAddressTa->Address[0].Address[0].in_addr;
        RemotePort = RemoteAddressTa->Address[0].Address[0].sin_port;
        break;

    default:
        UnlockObject(AddrFile, OldIrql);
        return STATUS_UNSUCCESSFUL;
    }

    LocalAddress = AddrFile->Address;
    if (AddrIsUnspecified(&LocalAddress))
    {
        /* If the local address is unspecified (0),
         * then use the unicast address of the
         * interface we're sending over
         */
        if(!(NCE = RouteGetRouteToDestination( &RemoteAddress ))) {
            UnlockObject(AddrFile, OldIrql);
            return STATUS_NETWORK_UNREACHABLE;
        }

        LocalAddress = NCE->Interface->Unicast;
    }
    else
    {
        if(!(NCE = NBLocateNeighbor( &LocalAddress, NULL ))) {
            UnlockObject(AddrFile, OldIrql);
            return STATUS_INVALID_PARAMETER;
        }
    }

    Status = BuildUDPPacket( AddrFile,
                             &Packet,
                             &RemoteAddress,
                             RemotePort,
                             &LocalAddress,
                             AddrFile->Port,
                             BufferData,
                             DataSize );

    UnlockObject(AddrFile, OldIrql);

    if( !NT_SUCCESS(Status) )
        return Status;

    Status = IPSendDatagram(&Packet, NCE);
    if (!NT_SUCCESS(Status))
        return Status;

    *DataUsed = DataSize;

    return STATUS_SUCCESS;
}

Referenced by FileOpenAddress().

UDPShutdown()

NTSTATUS UDPShutdown

(

VOID

)

Definition at line 364 of file udp.c.

{
  if (!UDPInitialized)
      return STATUS_SUCCESS;

  PortsShutdown( &UDPPorts );

  /* Deregister this protocol with IP layer */
  IPRegisterProtocol(IPPROTO_UDP, NULL);

  UDPInitialized = FALSE;

  return STATUS_SUCCESS;
}

Referenced by TiUnload().

UDPStartup()

NTSTATUS UDPStartup

(

VOID

)

Definition at line 337 of file udp.c.

{
  NTSTATUS Status;

#ifdef __NTDRIVER__
  RtlZeroMemory(&UDPStats, sizeof(UDP_STATISTICS));
#endif
  
  Status = PortsStartup( &UDPPorts, 1, UDP_STARTING_PORT + UDP_DYNAMIC_PORTS );

  if( !NT_SUCCESS(Status) ) return Status;

  /* Register this protocol with IP layer */
  IPRegisterProtocol(IPPROTO_UDP, UDPReceive);

  UDPInitialized = TRUE;

  return STATUS_SUCCESS;
}

Referenced by DriverEntry().

Variable Documentation

UDPStats

UDP_STATISTICS UDPStats

Definition at line 26 of file main.c.

Referenced by RawIPStartup(), and UDPStartup().